CP 2816 at New Lisbon, Wisconsin.

[@spitfirenutspitfirenut4835]

It’s a steam activated horn.

[@trainproductions8100]

Does 2816 have a horn instead of a whistle?

[@bjkrotzman8767]

I'm not positive, but it sounds that way. Another photographer mentioned it was a five chime, so very likely.

[@EJE665]

It has a air powered whistle (heard here) as well as it's original 6 chime whistle

[@trainproductions8100]

Thanks!